Slice the chicken breast into even 1-inch thick strips or tenders.
Place the chicken in a shallow bowl and pour the buttermilk over it, ensuring every piece is submerged; marinate for at least 20 minutes.
In a separate wide dish, whisk together the almond flour, arrowroot powder, smoked paprika, garlic powder, sea salt, and black pepper.
Preheat your air fryer to 400°F and lightly coat the basket with half of the avocado oil.
Remove each piece of chicken from the buttermilk, letting the excess drip off, then dredge thoroughly in the almond flour mixture, pressing the coating onto the meat.
Arrange the chicken in a single layer in the air fryer basket and mist the tops with the remaining avocado oil.
Air fry for 12-15 minutes, flipping halfway through, until the coating is deeply browned and the internal temperature reaches 165°F.
Let the chicken rest for 3 minutes before serving to maintain the crunch.